Viagra patent expires

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It’s the active ingredient in both branded Viagra and the drug Revatio version several years before Pfizer’s patent for Viagra was set to expire. PatSnap has announced new research into the expiry of Pfizer’s Viagra patent, and its potential impact upon the pharmaceutical industry. Per US patent law, drug makers get 20 years of exclusive market rights to selling their pills. Technically, Viagra’s patent holds until , but.